Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943309m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #433.09
Astronomy and Astrophysics
Astronomy
Scientific paper
Based on a homogeneous set of X-ray, infrared and ultraviolet observations from Chandra, Spitzer, GALEX and 2MASS archives, we study populations of high-mass X-ray binaries (HMXBs) in a sample of 29 nearby star-forming galaxies and their relation with the star formation rate (SFR). In agreement with previous results, we find that HMXBs are a good tracer of the recent star formation activity in the host galaxy and their collective luminosity and number scale with the SFR, in particular, Lx 2.6 x 1039 x SFR. However, the scaling relations still bear a rather large dispersion of rms 0.4 dex, which we believe is of a physical origin. We present the catalog of 1055 X-ray sources detected within the D25 ellipse for galaxies of our sample and construct the average X-ray luminosity function (XLF) of HMXBs with substantially improved statistical accuracy and better control of systematic effects than achieved in previous studies. The XLF follows a power law with slope of 1.6 in the logLx 35-40 luminosity range with a moderately significant evidence for a break or cut-off at Lx 1040 erg/s. As before, we did not find any features at the Eddington limit for a neutron star or a stellar mass black hole. We discuss implications of our results for the theory of binary evolution. In particular we estimate the fraction of compact objects that once upon their lifetime experienced an X-ray active phase powered by accretion from a high mass companion and obtain a rather large number, fx 0.2 x (0.1 Myr / tx) (tx is the life time of the X-ray active phase). This is 4 orders of magnitude more frequent than in LMXBs. We also derive constrains on the mass distribution of the secondary star in HMXBs.
Gilfanov Marat
Mineo Stefano
Sunyaev Rachid
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